mirror of
https://github.com/torvalds/linux
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90 lines
3 KiB
C
90 lines
3 KiB
C
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/*
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* runlist.h - Defines for runlist handling in NTFS Linux kernel driver.
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* Part of the Linux-NTFS project.
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*
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* Copyright (c) 2001-2004 Anton Altaparmakov
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* Copyright (c) 2002 Richard Russon
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*
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* This program/include file is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program/include file is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (in the main directory of the Linux-NTFS
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* distribution in the file COPYING); if not, write to the Free Software
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* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _LINUX_NTFS_RUNLIST_H
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#define _LINUX_NTFS_RUNLIST_H
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#include "types.h"
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#include "layout.h"
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#include "volume.h"
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/**
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* runlist_element - in memory vcn to lcn mapping array element
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* @vcn: starting vcn of the current array element
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* @lcn: starting lcn of the current array element
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* @length: length in clusters of the current array element
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*
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* The last vcn (in fact the last vcn + 1) is reached when length == 0.
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*
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* When lcn == -1 this means that the count vcns starting at vcn are not
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* physically allocated (i.e. this is a hole / data is sparse).
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*/
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typedef struct { /* In memory vcn to lcn mapping structure element. */
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VCN vcn; /* vcn = Starting virtual cluster number. */
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LCN lcn; /* lcn = Starting logical cluster number. */
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s64 length; /* Run length in clusters. */
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} runlist_element;
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/**
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* runlist - in memory vcn to lcn mapping array including a read/write lock
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* @rl: pointer to an array of runlist elements
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* @lock: read/write spinlock for serializing access to @rl
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*
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*/
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typedef struct {
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runlist_element *rl;
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struct rw_semaphore lock;
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} runlist;
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static inline void ntfs_init_runlist(runlist *rl)
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{
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rl->rl = NULL;
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init_rwsem(&rl->lock);
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}
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typedef enum {
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LCN_HOLE = -1, /* Keep this as highest value or die! */
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LCN_RL_NOT_MAPPED = -2,
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LCN_ENOENT = -3,
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} LCN_SPECIAL_VALUES;
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extern runlist_element *ntfs_runlists_merge(runlist_element *drl,
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runlist_element *srl);
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extern runlist_element *ntfs_mapping_pairs_decompress(const ntfs_volume *vol,
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const ATTR_RECORD *attr, runlist_element *old_rl);
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extern LCN ntfs_rl_vcn_to_lcn(const runlist_element *rl, const VCN vcn);
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extern int ntfs_get_size_for_mapping_pairs(const ntfs_volume *vol,
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const runlist_element *rl, const VCN start_vcn);
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extern int ntfs_mapping_pairs_build(const ntfs_volume *vol, s8 *dst,
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const int dst_len, const runlist_element *rl,
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const VCN start_vcn, VCN *const stop_vcn);
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extern int ntfs_rl_truncate_nolock(const ntfs_volume *vol,
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runlist *const runlist, const s64 new_length);
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#endif /* _LINUX_NTFS_RUNLIST_H */
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